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A digital optical computation system must store binary optical signals in addition to performing optical logic operations. Theoretically, any digital system can be constructed entirely from NAND (or NOR) gates and flip-flops, in which the gates perform the logic and the flip-flops perform memory functions. Recently, we have observed direct polarization switching [1] and polarization bistability [2] in InGaAsP/InP lasers. With very simple circuitry, we have demonstrated operations of optical logic gates and flip-flops based on these lasers.
© 1985 Optical Society of America
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